Fitzcarraldo,
thanks for the reply.
I've looked at the post, but that guy has a diffent problem, his webcam was not working at all.

My webcam is working fine with cheese, vlc and all the other webcam/video sw, but not with skype.
To use it with skype I've to load the ov51x-jpeg module with the option forceblock=1
That's the point,
if I manually load the option it works great, but it looks like the "system" doesn't like this option during the boot.